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Ocean Surface Topography from Space
Ocean High Frequency Dynamics de-aliasing and related Geodetics


Florent Lyard - (LEGOS)

  Cancet, Mathilde
Gégout, Pascal
Bizouard, Christian
Carrère, Loren
Boy, Jean-Paul
Allain, Damien

M2 tide, FES2014 global atlas: amplitude (m)
M2 tide, FES2014 global atlas: amplitude (m)
High frequency corrections are a crucial contributor to the sea level error budget. During the last 25 years, enormous efforts and consecutive improvements have been made to reach the requested accuracy for ocean altimetry satellite missions. In most of the ocean surface, the present tidal and storm surges corrections are close to the targeted accuracy. However the error budget is not homogeneous and shallow seas and high latitude/polar seas still remain an issue. In addition, some more demanding satellite data applications (such as meso and sub-meso scales investigations) are challenging the former definition of error budget target levels. The LEGOS laboratory, remains deeply involved in improving the tidal atlases and providing storm surge simulations needed by sea level de-aliasing processing.

Our objective is to focus on reducing the geographical heterogeneity of the error budget and investigating on more subtle, but significant, terms such as tidal and atmospheric loading in coastal regions, non-linear tides in deep oceans and internal tide surface signal. Main modelling efforts will be put on unstructured mesh resolution, with a (close to) 1 km target in coastal regions, bathymetry improvements and improved loading and self-attraction, as well for tidal and storm surges simulations. Improved wind stress parameterization (including ocean waves derived wind stress) will be evaluated. Massive data assimilation for tidal atlases will also be investigated.

In addition, the project will investigate the ocean mass distribution related effects on the solid Earth. Actually, tackling residual errors in the altimetry observation and correction system now requires considering the coupling of the various physics and monitoring systems, or, in other words, considering the errors correlations in error budget of the satellite altimetry observing systems.

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